Storage device realignment
Realigning storage devices arranged as storage arrays when one of the storage arrays enters a critical state after failure of a storage device is disclosed. The method is particularly useful for RAID groups of storage devices. The method may be used with hard disk drives, solid-state drives, and other storage devices arranged as groups. The method includes identifying that a storage array of a plurality of storage arrays is in a critical condition. A critical condition storage array and a healthy storage array are identified. Both the critical condition storage array and the healthy storage array are rebuilt. The rebuilding includes configuring the critical condition storage array to include a storage device from the healthy storage array and configuring the healthy storage array to function with one less storage device. The method may be implemented in hardware, firmware, software, or a combination thereof.
1. A method for realigning storage arrays comprising:
identifying that a first storage array of a plurality of storage arrays is in a critical condition
identifying a critical condition storage array
identifying a healthy storage array
rebuilding both the critical condition storage array and the healthy storage array including
configuring the critical condition storage array to include a storage device from the identified healthy storage array
configuring the identified healthy storage array to function with one less storage device.
2. The method of claim 1 wherein identifying that the first storage array of the plurality of storage arrays is in the critical condition comprises:
determining that the first storage array will lose data or become inaccessible should a storage device included in the first storage array fail.
3. The method of claim 1 wherein identifying a healthy storage array comprises:
locating a second storage array of the plurality of storage arrays having all constituent storage devices functioning normally.
4. The method of claim 1 wherein the plurality of storage arrays are each configured as a Redundant Array of Inexpensive Disks (RAID).
5. The method of claim 1 wherein the plurality of storage arrays are each a Redundant Array of Inexpensive Disks (RAID) that include hard disk drives.
6. The method of claim 1 wherein the plurality of storage arrays are each a Redundant Array of Inexpensive Disks (RAID) that include solid-state drives.
7. The method of claim 1 wherein the critical condition storage array is one of the plurality of storage arrays that has at least one failed storage device and will become inaccessible should another storage device of the critical condition storage array fail.
8. The method of claim 1 wherein identifying that the first storage array of the plurality of storage arrays is in the critical condition comprises:
evaluating whether a storage device in the first storage array has more than a system defined number of bad blocks, bad sectors or bad logical units.
9. The method of claim 1 wherein the rebuilding results in both the healthy storage array and the critical condition storage array operating in a degraded mode.
10. A non-transitory storage medium having instructions stored thereon which when executed by a processor cause the processor to perform actions comprising:
identifying that a first storage array of the plurality of storage arrays is in a critical condition
identifying a critical condition storage array
identifying a healthy storage array
rebuilding both the critical condition storage array and the healthy storage array including
configuring the critical condition storage array to include a storage device from the identified healthy storage array
configuring the identified healthy storage array to function with one less storage device.
11. The non-transitory storage medium of claim 10 wherein identifying that the first storage array of the plurality of storage arrays is in the critical condition comprises:
determining that the first storage array will lose data or become in accessible should a storage device included in the first storage array fail.
12. The non-transitory storage medium of claim 10 wherein identifying a healthy storage array comprises:
locating a second storage array of the plurality of storage arrays having all constituent storage devices functioning normally.
13. The non-transitory storage medium of claim 10 wherein the plurality of storage arrays are each configured as a Redundant Array of Inexpensive Disks (RAID).
14. The non-transitory storage medium of claim 10 wherein the plurality of storage arrays are each a Redundant Array of Inexpensive Disks (RAID) that include hard disk drives.
15. The non-transitory storage medium of claim 10 wherein the plurality of storage arrays are each a Redundant Array of Inexpensive Disks (RAID) that include solid-state drives.
16. The non-transitory storage medium of claim 10 wherein the critical condition storage array is one of the plurality of storage arrays that has at least one failed storage device and will become inaccessible should another storage device of the critical condition storage array fail.
17. The non-transitory storage medium of claim 10 wherein identifying that the first storage array of the plurality of storage arrays is in the critical condition includes:
evaluating whether a storage device in the first storage array has more than a system defined number of bad blocks, bad sectors or bad logical units.
18. The non-transitory storage medium of claim 10 wherein the rebuilding results in both the healthy storage array and the critical condition storage array operating in a degraded mode.
19. A computing device to manage a plurality of storage arrays of storage devices, the computing device comprising:
a processor;
a memory coupled with the processor;
a storage medium having instructions stored thereon which when executed cause the computing device to perform actions comprising:
identifying that a first storage array of the plurality of storage arrays is in a critical condition
identifying a critical condition storage array
identifying a healthy storage array
rebuilding both the critical condition storage array and the healthy storage array including
configuring the critical condition storage array to include a storage device from the identified healthy storage array
configuring the identified healthy storage array to function with one less storage device.
20. The computing device of claim 19 wherein identifying that a first storage array of the plurality of storage arrays is in a critical condition comprises:
determining that the first storage array will lose data or become inaccessible should a storage device included in the first storage array fail.
21. The computing device of claim 19 wherein identifying a healthy storage array comprises:
locating a second storage array of the plurality of storage arrays having all constituent storage devices functioning normally.
22. The computing device of claim 19 wherein the plurality of storage arrays are each configured as a Redundant Array of Inexpensive Disks (RAID).
23. The computing device of claim 19 wherein the plurality of storage arrays are each a Redundant Array of Inexpensive Disks (RAID) that include hard disk drives.
24. The computing device of claim 19 wherein the plurality of storage arrays are each a Redundant Array of Inexpensive Disks (RAID) that include solid-state drives.
25. The computing device of claim 19 wherein the critical condition storage array is one of the plurality of storage arrays that has at least one failed storage device and will become inaccessible should another storage device of the critical condition storage array fail.
26. The computing device of claim 19 wherein identifying that a first storage array of the plurality of storage arrays is in a critical condition includes:
evaluating whether a storage device of the first storage array has more than a system defined number of bad blocks, bad sectors or bad logical units.
27. The computing device of claim 19 wherein the rebuilding results in both the healthy storage array and the critical condition storage array operating in a degraded mode.